How To Link Cameras At 8 Separate Locations To A Single VMS?

Thanks in advance for any help on this topic.

I have a project I'm bidding, it is a community that is going to be installing gates and cameras on 8 separate entrances. Each entrance will have it's own router and I need to have all the cameras linked together so I can use one NVR or VMS solution. Would a VPN be the best way to do this having 8 different routers.

We will have a plate camera and an overview camera at each location so 16 cameras total.

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